<!DOCTYPE html>
<style>
  td { border: 6px solid black }
  tbody { will-change: transform }
</style>
Should repaint collapsed borders when cells resize.
<table style="width: 300px; border-collapse: collapse">
  <tr>
    <td>A</td><td id="cell" style="width: 100px">B</td><td>C</td>
  </tr>
</table>
<script src="../../../resources/run-after-layout-and-paint.js"></script>
<script>
runAfterLayoutAndPaint(function() {
  cell.style.width = '200px';
}, true);
</script>
